Supco's normally closed high pressure switch features 1/4" female threads for easy installation onto the refrigerant port on the high side. It activates by opening at 550 psig and resets by closing at 450 psig, with 1/4" male wire terminals for secure connections. This switch serves as a reliable brand-name replacement for Dometic models 4024214 and 290000197, offering a slightly lower pressure rating than Dometic’s original 575 psig without compromising safety. It is commonly used in R410A systems and is an alternative to the Wilspec HS100-22-0017 and 19-50-E models.
